Snap locking coupling system for pieces or coupling members

ABSTRACT

A snap coupling system for pieces or metallic or non metallic coupling members, that require to be attached perpendicularly in a “T” fashion, in a cross “+” fashion or angularly, by which a tubular male coupling member having one or more retention tabs that are temporally flexed, enters in slots or receiving apertures of another piece or female coupling member, tubular or planar, where they engage, by which they can be readily attached two tubular members or one tubular member and one planar member, in a perpendicular way, in a cross fashion or angularly, without the necessity of using skilled labor.

BACKGROUND OF THE INVENTION

A. Field of the Invention

This invention refers to a snap coupling system which allows instant coupling and safely linking of several coupling members to each other, wherein one or more retention tabs of one male tubular coupling member is temporally flexed to enter into guides or receiving cavities of another female tubular coupling member in which the tabs snaps are engaged; and more particularly is related to a special snap coupling system for joining at least one tubular member to another tubular or flat member in different coupling angles.

B. Background of the Invention

Snap joins are well known, these are commonly used to instantly coupling and securing a variety of tubular coupling members to each other, particularly of plastic materials because the plastic material is particularly suitable because of its flexibility which allows that coupling protrusions of the snap joints could be temporarily flexed to be introduced into a coupling receptacle of another tubular member.

The advantage of the snap joint couplings, is that allow to couple two tubular coupling members without the necessity to use adhesives, bolts, screws, nor special tools to thermally join said tubular coupling members, for which it is necessary to use qualified manpower.

For metallic or non-metallic coupling members, the thermal join by means of welding or fusion is the common way of permanently joining said metallic or non-metallic coupling members. Other joining methods of metallic or non-metallic coupling members involve the use of adhesives or the use of a third holding member to carry out the joining or holding of the elements to each other.

The joining by means of welding, requires special tools as well as qualified manpower and safety equipment. Additionally, the application of welding requires counting with a power source of fuel, as well as measuring and calibration instruments for the materials in order to achieve a squaring of the join (use of levels and squares).

In view of the former, applicants developed a snap coupling system special for metallic or non metallic coupling members requiring joining in diverse coupling angles, by which a tubular male coupling member having one o more retention tabs which are temporarily flexed to enter into guides or receiving cavities of another female coupling member either tubular or flat, in which the tabs snaps, by which two coupling members can be rapidly joined, without the necessity of qualified manpower.

By means of the snap coupling system, of the present invention, two metallic or non metallic coupling members can be permanently or semi permanently joined in diverse coupling angles, without the necessity of use welding, adhesives, additional holding elements, instruments or tools, with which time is saving by avoiding the use of welding. Besides, as the snap coupling uses guides to carry out said coupling, the necessity to measure and size the coupling members is avoided in order to achieve a precise joining, with which one can obtain additional time saving in the joining of the metallic or non-metallic coupling members.

Furthermore, as by means of the snap coupling system of the present invention, the coupling members can be easily assembled in the place wherein these will be used, it is not necessary to transport to the assembling place the assembled or welded pieces in structures which can be too large and difficult to transport.

The snap coupling system of the present invention, promotes the design of individual pieces or coupling members to be assembled, which can be efficiently packed and translated.

SUMMARY OF THE INVENTION

It is therefore a main object of the present invention, to provide a snap coupling system between coupling members, special to join metallic or non-metallic coupling members, in diverse coupling angles, by which a tubular male coupling member having one or more retention tabs which are temporarily flexed to enter into slots or receiving cavities of another female coupling member either tubular or flat, in which the tabs snaps, by which two coupling members can be rapidly joined, without the necessity of qualified manpower.

It is another main object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, by which two metallic or non-metallic coupling members can be permanently coupled in diverse coupling angles, without the necessity to use welding, additional holding elements or tools, by which time is saved because its welding is not necessary.

It is still another main object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, in which the snap coupling provides guides in the coupling members, to carry out the coupling, with which the need of measuring and sizing the coupling members to get a precise coupling is avoided, obtaining additional saving of time in the coupling of the two coupling members.

It is an additional object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, by which coupling members can be easily coupled in the place in which the they are going to be used, without the necessity to transport the coupling members already welded to the assembling place, in structures which can be too long and difficult to be transported.

It is another additional object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, which promotes the design of individual coupling members which can be efficiently packed and translate.

These and other objects and advantages of the snap coupling system between coupling members, of the present invention, will be clear enough to those persons having ordinary skill in the art, from the following detailed description of the embodiments of the invention, which will be disclosed with reference to the accompanied drawings and which will be within the true scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1, is a conventional schematic perspective view of the snap coupling system between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section, showing retention tabs lifted in an angle directed outwardly and a tubular female coupling member, of a quadrangular cross section sowing retention slots, to be assembled with the male coupling member, in a “T” fashion, which constitutes a first preferred embodiment of the system of the present invention;

FIG. 1A, is a schematic conventional perspective view of the snap coupling system between coupling members, of the present invention, similar to that of FIG. 1, showing retention tabs introduced in an angle directed;

FIG. 1B, is a schematic conventional perspective view of the snap coupling system between coupling members, of FIG. 1, of the present invention, assembled, showing its coupling members partially cut;

FIG. 1C, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing the tubular male coupling member, of a quadrangular cross section, showing a retention tab lifted in an angle directed outwardly, in each of the walls of a coupling end, and a tubular female coupling member, of a quadrangular cross section, showing a retention quadrangular aperture in one coupling wall of the female coupling member, paced in an intermediate portion thereof, to be assembled with the male coupling member, in a “T” fashion, constituting another preferred embodiment of the system of FIG. 1, in accordance with the present invention; and

FIG. 1D, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 1, of the present invention, fully assembled;

FIG. 2 is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section showing its retention tabs lifted in an angle directed outwardly and a tubular female coupling, of quadrangular cross section, sowing its retention slots, to be assembled to each other is a “+” fashion, constituting a second preferred embodiment of the system, according to the present invention;

FIG. 2A is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of FIG. 2, showing the retention tabs of both the male member and the female member;

FIG. 2B, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 2, of the present invention, fully assembled in a “+” fashion;

FIG. 3, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a quadrangular cross section, showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member of a circular cross section, showing its retention slots for the coupling in a “T” fashion, constituting a third preferred embodiment of the system, according to the present invention;

FIG. 3A is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of FIG. 3, showing the retention tabs introduced in an angle directed inwardly;

FIG. 3B, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 3, of the present invention, fully assembled in a “T” fashion;

FIG. 4, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a circular cross section, showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a circular cross section, showing its retention slots, for its coupling in a “T” fashion, constituting a fourth preferred embodiment of the system according with the present invention;

FIG. 4A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of FIG. 4, showing retention tabs introduced in an angle directed inwardly;

FIG. 4B, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 4, of the present invention, fully assembled in a “T” fashion;

FIG. 5, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a circular cross section, showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its retention slots curved for its coupling in a “T” fashion, constituting a fifth preferred embodiment of the system according to the present invention;

FIG. 5A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of FIG. 5, showing the retention tabs introduced in an angle directed inwardly;

FIG. 5B, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 5, of the present invention, fully assembled in a “T” fashion”

FIG. 6, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section, showing retention tabs lifted in an angle directed outwardly and a quadrangular retention cut, and a tubular female coupling member, of a circular cross section, showing its retention slots, for its coupling in a “+” fashion, constituting a sixth preferred embodiment of the system according to the present invention;

FIG. 6A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section, similar to that of FIG. 6, showing retention tabs lifted in an angle directed inwardly;

FIG. 6B, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of FIG. 6, fully assembled in a “+” fashion;

FIG. 7, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a circular cross section, showing its retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its quadrangular retention cut for its coupling in a “+” fashion, constituting a seventh preferred embodiment of the system according to the present invention;

FIG. 7A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of FIG. 7, fully assembled in a “+” fashion;

FIG. 8, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a circular cross section showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member of a circular cross section, showing its quadrangular cut, for its coupling in a “+” fashion, which constitutes an eight preferred embodiment of the system according with the present invention;

FIG. 8A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of FIG. 8, fully assembled in a “+” fashion;

FIG. 9, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a quadrangular cross section, showing retention tabs angularly cut and lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its retention slots to be assembled to each other in an angular fashion constituting a ninth preferred embodiment of the system according with the present invention;

FIG. 9A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of FIG. 9, showing retention tabs angularly cut and in an angle directed inwardly;

FIG. 9B is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 9, fully assembled in an angular fashion;

FIG. 10, is a schematic conventional perspective view of a tenth embodiment of the snap coupling system, between coupling members, showing a tubular male coupling member of a quadrangular cross section, showing two retention tabs in its lateral walls, and two retention tabs in its upper and lower walls, opposed to the lateral walls, lifted in an angle directed outwardly, and a tubular female coupling member of a quadrangular cross section, showing a passing through retention aperture, for assembling to each other in a “+” fashion;

FIG. 10A, is a schematic conventional perspective view of the snap coupling system, between coupling members, showing a tubular male coupling member of a quadrangular cross section, showing in turn two retention tabs opposed to each other, in each one of its walls, lifted in an angle directed outwardly, and a tubular female coupling member of a quadrangular cross section, showing a passing trough retention aperture, to be assembled to each other in a “+” fashion;

FIG. 10B, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 10, showing a tubular male coupling member of a quadrangular cross section y un tubular female coupling member of a quadrangular cross section, fully assembled to each other, in a “+” fashion;

FIG. 11, is a schematic front view, of an eleventh embodiment of the snap coupling system, between coupling members, showing a tubular male coupling member of a quadrangular cross section, showing in turn its retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its passing through retention aperture, to be assembled to each other, in a “+” fashion, forming a fence or gate;

FIG. 11A, is a schematic conventional perspective view of the snap coupling system, between coupling members, of FIG. 11, forming a fence or grid, partially assembled; and

FIG. 11B, is a frontal view, similar to that of FIG. 11A, showing a variant of the arrangement of the tabs of the male coupling member forming a fence or gate partially assembled.

DETAILED DESCRIPTION OF THE INVENTION

The snap coupling system, of the present invention, will be described with reference to the accompanying drawings, using reference numbers to identify the constitutive parts of the system, shown in the drawings which illustrate the preferred embodiments of the invention.

In said specific embodiments, the snap coupling system, of the present invention, which is useful for the assembling of elements of structural use such as those used in the manufacture of: railings, fences, bars and protective fences, gates, surrounding fences, protective screens, carpots, trailers, greenhouses, racks, disassembled structures, pergolas, and canopies, automotive, with line furniture, chassis, metallic furniture, among others.

Referring to a first embodiment of the snap coupling system, between tubular coupling members of a quadrangular cross section, for its assembling in a “T” fashion, of the present invention, illustrated in FIG. 1, this comprises:

a tubular male coupling member 1, of a quadrangular cross section, of: a first end 2 a and a second end 2 b; a first lateral wall 3 a and a second lateral wall 3 b; an upper wall 4 a and a lower wall 4 b; a first projection 5 a extending from the first end 2 a of the first side wall 3 a of the a tubular male coupling member 1, said projection 5 a including a retention tab 6 a, cut therein, directed to the second end 2 b of said a tubular male coupling member 1 and lifted in an angle outwardly of said a tubular male coupling member 1, having a retention edge 7 a; and a second projection 5 b extending from the first end 2 a of the second side wall 3 b of the a tubular male coupling member 1, said projection 5 b including a retention tab 6 b cut therein, directed also to the second end 2 b of the a tubular male coupling member 1 and lifted in a angle directed outwardly of said a tubular male coupling member 1, having a retention edge 7 b (not illustrated);

a tubular female coupling member 10 to be perpendicularly coupled to the a tubular male coupling member 1, in a “T” fashion, of a quadrangular cross section, and having: a first end 11 a and a second end 11 b; a first side wall 12 a and a second side wall 12 b, and an upper wall 13 a and a lower wall 13 b, each of which having an inner wall and an outer wall; a first and a second parallel transversal slots 14 a, 14 b, each of which extending vertically widthwise to the first side wall 12 a of the a tubular female coupling member 10, as it is illustrated in FIG. 1, wherein the distance between the first and second slots 14 a and 14 b is similar to the distance existing between the first and second projections 5 a and 5 b of the tubular male coupling member 1, as it is illustrated in FIGS. 1, 1B and 1D; and

wherein the first and second projections 5 a and 5 b, with its respective retention tabs 6 a and 6 b, of the side walls 3 a and 3 b of the a tubular male coupling member 1, passing in a guided way, momentarily flexing said tabs, trough the parallel first and second transversal slots 14 a and 14 b of the first side wall 12 a of the a tubular female coupling member 10, en a perpendicular way, such that, when the tabs recover its position, its retention edge 7 a, 7 b (not illustrated) are locked at the inner surface of the first side wall 12 a of the a tubular female coupling member 10, being retained both coupling members to each other.

In the embodiment illustrated in FIG. 1A, the retention tabs 6 a and 6 b (not illustrated) are flexed inwardly of the inner surface of the side walls 3 a and 3 b of the tubular male coupling member 1, conversely to the embodiment illustrated in FIG. 1.

In the embodiment of FIG. 1C, the a tubular male coupling member, of a quadrangular cross section, comprising two retention tabs 6 a, 6 b (not illustrated) lifted in an angle directed outwardly, each of which placed in each of the respective side walls 3 a and 3 b of the first end 2 a of the a tubular male coupling member 1, and two retention tabs 6 c, 6 d (not illustrated) lifted also in an angle directed outwardly, placed at the same height of the tabs 6 a and 6 b (not illustrated), each of which placed in each of the respective upper and lower walls 4 a and 4 b in the same first end of the a tubular male coupling member 1; and;

the tubular female coupling member 10, of a quadrangular cross section, showing a quadrangular retention aperture 15 in an intermediate portion of the side wall 12 a of the a tubular female coupling member 10, to be assembled with the a tubular male coupling member 1, in a “T” fashion, constituting another preferred embodiment of the system of FIG. 1, according with the present invention.

It should be understand that it is possible that some of the walls of the tubular male coupling member, could include only one tab lifted outwardly or inwardly; and the tubular female coupling member could include a single slot, to give a required assembling force.

Or else, it is possible that one of the walls of the a tubular male coupling member, could include a first tab in one of its walls and a second tab in an opposite wall, placed opposite to the first tab, both lifted outwardly; and the tubular female coupling member could have a quadrangular aperture, to provide stronger assembling force.

In all the preferred embodiments, the parallel transversal slots 14 a and 14 b (FIG. 1) or the quadrangular aperture 15 (FIG. 1C) are made with means which allow high precision cuts such as a cutter by water jet cutting, oxygen cut, plasma cutting and laser cutting and precision die cut, to mention some of them, in order to obtain precision cuts allowing the insertion of the first and second projections 5 a and 5 b with very close tolerances which provides an optimum adjustment to the joining.

Also, it should be understand that the projections and/or the tabs of the tubular male coupling member should be dimensioned such that they could enter into the slots or quadrangular apertures of the tubular female coupling member.

The retention tabs 6 a and 6 b of the first and second projections 5 a and 5 b (FIG. 1) are formed in said projections by means of a semi quadrangular cut which defines the form of each tab, and afterwards each tab 6 a and 6 b already formed, is flexed and lifted in an angle directed inwardly or outwardly regarding the plane of the corresponding projections 5 a and 5 b, such that the retention edge 7 a and 7 b remain protruded outwardly or inwardly of the a tubular male coupling member 1, so that they locked leaning on the inner edge of the slots 14 a and 14 b of the tubular female coupling member 10.

Additionally, each tab 6 a and 6 b can include a notch in a central portion of the end thereof in order to introduce a tool there through and facilitate flexing of the tab to a desired position.

When both tubular male 1 and female 10 coupling members are to be joined, the first and second projections 6 a and 6 b of the a tubular male coupling member 1 are perpendicularly inserted into the first and second parallel slots 14 a, 14 b of the a tubular female coupling member 10, such that the retention tab 6 a, 6 b of each projection 5 a, 5 b are flexed staying in the same plane as the corresponding projection 5 a, 5 b, until it completely enters perpendicularly into the parallel slots 14 a, 14 b of the a tubular female coupling member 10, and turns back by deflection to its lifted or sunken position, such that the retention edge 7 a, 7 b of each tab 6 a and 6 b, form a padlock being locked on the inner surface of the inner surface of the first side wall 12 a of the a tubular female coupling member 10, as it is shown in FIGS. 1, 1A, 1B, 1C and 1D, avoiding that the projection 6 a, 6 b could slide outside of the slot 14 a, 14 b of the a tubular female coupling member 10.

Additionally that the projections 6 a, 6 b of the a tubular male coupling member 1 cannot be withdrawn from the a tubular female coupling member 10, they also cannot turn because of the closed tolerance with which they were inserted, because there is no space of “backlash” between the projections 5 a and 5 b, the parallel transversal slots 14 a, 14 b and the inner surface of the first side wall 12 a of the a tubular female coupling member 10.

In this way, in the preferred embodiments of the invention, illustrated in FIG. 1 and in FIG. 1A, the a tubular male coupling member 1 stay joined by an end 2 a to the a tubular female coupling member 10, perpendicularly, forming a “T” as it is shown in FIG. 1B and FIG. 1D.

The joining between the a tubular male coupling member 1 and the a tubular female coupling member 10, can or cannot be disassembled, depending of the position and angle of each tab in the moment of the insertion of the projections. In the preferred embodiments of the invention, the joining is permanent.

In a second embodiment of the invention, illustrated in FIG. 2, the snap coupling system, between coupling members of a quadrangular cross section to be assembled in a “+” fashion, of the present invention, this comprises:

a tubular male coupling member 20, of a quadrangular cross section, having: a first side wall 21 a and a second side wall 21 b; an upper wall 22 a and a lower wall 22 b; a first and a second slots 23 a, 23 b, parallel to each other, both made transversally at an intermediate portion of the side walls 21 a and 21 b, extending from the edge of the lower wall 22 b to the upper wall 22 a; a first retention tab 24 a and a second retention tab 24 b (not illustrated), both practiced between the slots 23 a and 23 b, in each side wall 21 a and 21 b, beginning from the lower wall 22 b to the upper wall 22 a, presenting a retention edge 25 a and 25 b (not illustrated), respectively;

a tubular female coupling member 30, of a quadrangular cross section, to be perpendicularly coupled to the a tubular male coupling member 20 in a “+” fashion, having a first side wall 31 a and a second side wall 31 b; an upper wall 32 a and a lower wall 32 b; a first transversal slot 33 a and a second transversal slot 33 b (not illustrated), parallel to each other, each of which extends vertically from the upper wall 32 a to the lower wall 32 b; and a quadrangular cut 34 in the upper wall 32 a, to allow the insertion of the a tubular male coupling member 20, between the slots 33 a and 33 b (not illustrated), so that the retention edges 25 a and 25 b (not illustrated) stay locked against the inner edges of the upper edge of the upper wall 32 a at both sides of the quadrangular cut 34, staying in this way coupled the a tubular male coupling member 20, with the a tubular female coupling member 30 in a “+” fashion as it is illustrated in FIGS. 2 and 2B;

The tubular male coupling member 20, further including a quadrangular cut (not illustrated) in its lower wall 22 b, in such a way that can be tightly received in the tubular female coupling member 30 to form a joining in a “+” fashion between both tubular coupling members.

To obtain a “+” highly secure, as it is illustrated in FIG. 2A, the tubular female coupling member 40 can include, beside of the slots 43 a and 43 b and the quadrangular cut 44, a first retention tab 45 a and a second retaining tab 45 b, both practiced between the slots 43 a and 43 b, in each lateral wall 41 a and 41 b, starting from the edge of the lower wall 42 b to the upper wall 42 a, presenting a retention edge 46 a and 46 b (not illustrated), respectively, staying in this way firmly coupled the tubular male coupling member 20 with the tubular female coupling member 40 in a “+” fashion.

In a third embodiment of the invention, illustrated in FIG. 3, the snap coupling system, between a tubular male coupling member, of a quadrangular cross section, to be coupled in a “T” fashion with a tubular female coupling member, of a circular cross section, of the present invention, this comprises:

a tubular male coupling member 50, of a quadrangular cross section, having a first end 51 a and a second end 51 b; a first side wall 52 a, and a second side wall 52 b; an upper wall 53 a and a lower wall 53 b; a first projection 54 a extending from the first end 51 a of the first side wall 52 a of the a tubular male coupling member 50, said projection 54 a including a retention tab 55 a, cut in therein, directed to a second end 51 b of said a tubular male coupling member 50 and lifted in an angle outwardly of said a tubular male coupling member 50, presenting a retention edge 56 a; and a second projection 54 b, extending from the first end 51 a of the second side wall 52 b of the tubular male coupling member 50, said projection 54 b including a retention tab 55 b, cut therein, directed also to the second end 51 b of said a tubular male coupling member 50 and lifted in an angle outwardly of said a tubular male coupling member 50, presenting a retention edge 56 b (not illustrated).

a tubular female coupling member 60 to be perpendicularly coupled to the a tubular male coupling member 50, in a “T” fashion, of a circular cross section, having: an inner surface and an outer surface; a first end 61 a and a second end 61 b; a first and a second parallel transversal slots 62 a, 62 b, aligned at the same height to each other, in an intermediate portion of the a tubular female coupling member 60, each of which extends vertically widthwise of the of the wall of the tubular female coupling member 60, such as it is illustrated in FIG. 3, wherein the distance between the first and second slots 62 a, 62 b is similar to the distance existing between the first and second projections 54 a, 54 b of the tubular male coupling member 50 as it is illustrated in FIG. 3;

the projections 54 a, 54 b and its retention edges 56 a and 56 b, (not illustrated), preferably having its edge curved, with the same curvature as the a tubular female coupling member 60;

wherein the first and second projections 54 a and 54 b with their respective retention tabs 55 a and 55 b of the side walls 52 a and 52 b of the a tubular male coupling member 50, passing in a guided way through the first and second parallel transversal slots 62 a, 62 b of the surrounding wall of the a tubular female coupling member 60 in a perpendicular way, so that the retention edge 56 a, 56 b (no illustrated) of each of the first and second retention tabs 56 a and 56 b of the projections 54 a, 54 b, be locked at the inner wall of the a tubular female coupling member 60, being retained both coupling members to each other, in a “T” fashion, as can be observed from FIG. 3B.

In the embodiment illustrated in FIG. 3A, the retention tabs 55 a and 55 b stay flexed inwardly of the inner surface of the side walls 52 a and 52 b of the tubular male coupling member 50, inversely from the embodiment illustrated in FIG. 3.

In a fourth embodiment of the invention, illustrated in FIG. 4, the snap coupling system, between a tubular male coupling member, of a circular cross section, to be assembled in a “T” fashion with a tubular female coupling member, of a circular cross section, of the present invention, this comprises:

a tubular male coupling member 70, of a circular cross section, and having: a first end 71 a and a second end 71 b; a first projection 72 a extending from the first end 71 a of the a tubular male coupling member 70, said projection 72 a including a retention tab 73 a, cut therein, directed from the second end 71 b of said tubular male coupling member 70 and lifted in an angle outwardly of the a tubular male coupling member 70, presenting a retention edge 74 a; and a second projection 72 b extending from the first end 71 a of the a tubular male coupling member 70, opposite to the first projection 72 a, said second projection 72 b including a retention tab 73 b, cut therein, directed also to the second end 71 b of said tubular male coupling member 70 and lifted in an angle outwardly of the a tubular male coupling member 70, presenting a retention edge 74 b (not illustrated);

a tubular female coupling member 80 to be perpendicularly coupled to the a tubular male coupling member 70, in a “T” fashion, of a circular cross section and having: an inner surface and an outer surface; a first end 81 a and a second end 81 b; a first and a second parallel transversal slots 82 a, 82 b aligned at the same height to each other, at an intermediate portion of the a tubular female coupling member 80, each of which extends vertically widthwise of the wall of the a tubular female coupling member 80, such as illustrated in FIG. 4, wherein the distance between the first and second slots 82 a and 82 b is similar to the distance existing between the first and second projections 72 a and 72 b of the a tubular male coupling member 70, such as is illustrated in FIG. 4;

the projections 72 a and 72 b and its retention edges 74 a and 74 b (not illustrated) preferably having its edge curved with the same curvature as the tubular female coupling member 80,

wherein the first and second projections 72 a and 72 b, with their respective retention tabs 73 a and 73 b of the tubular male coupling member 70, passing in a guided way through the first and second parallel transversal slots 82 a, 82 b of the tubular female coupling member 80, in a perpendicularly way, such that the retention edge 74 a, 74 b (not illustrated) of each of the first and second retention tabs 73 a and 73 b of the projections 72 a, 72 b, stay locked on the inner surface of the a tubular female coupling member 80, being retained both coupling members to each other in a “T” fashion, such as can be observed from FIG. 4B.

In the embodiment illustrated in FIG. 4A, the retention tabs 73 a and 73 b are flexed inwardly of the inner surface of the tubular male coupling member 70, inversely to the embodiment illustrated in FIG. 4.

In a fifth embodiment of the invention, illustrated in FIG. 5, the snap coupling system, between tubular male coupling member, of a circular cross section to be assembled in a “T” fashion, with a tubular female coupling member, of quadrangular cross section, of the present invention, this comprises:

tubular male coupling member 90 of a circular cross section, having: a first end 91 a and a second end 91 b; a first projection 92 a extending from the first end 91 a of the tubular male coupling member 90, said projection 92 a including a retention tab 93 a, cut therein, directed to the second end 91 b of said tubular male coupling member 90 and lifted in angle outside of said tubular male coupling member 90, presenting a retention edge 94 a; and a second projection 92 b opposite to the a first projection 92 a in the same end 91 a, extending from the first end 91 a of the tubular male coupling member 90, to the second end 91 b of the tubular male coupling member 90, said second projection 92 b including a retention tab 93 b cut therein, directed also to the second end 91 b of tubular male coupling member 90 and lifted in an angle directed outwardly of said tubular male coupling member 90, presenting a retention edge 94 b (not illustrated);

tubular female coupling member 100, to be perpendicularly coupled to the tubular male coupling member 90, in a “T” fashion, of a quadrangular cross section, having an inner surface and an outer surface; a first end 101 a and a second end 101 b; a first lateral wall 102 a and a second lateral wall 102 b; and an upper wall 103 a and a lower wall 103 b, a first and a second parallel transversal slots 104 a, 104 b, having a curvature to the ends 101 and 101 b respectively, similar to those of the projections 92 a, 92 b of the tubular male coupling member 90, aligned at the same height to each other, at an intermediate portion of the tubular female coupling member 100, each of which extending vertically widthwise of the side wall 102 a of the tubular female coupling member 100, such as it is illustrated in FIG. 5, wherein the distance between the first and second slots 104 a and 104 b is similar to the distance existing between the first and second projections 92 a and 92 b of the tubular male coupling member 90, such as it is illustrated in FIG. 5;

wherein the first and second projections 92 a, 92 b with its respective retention tabs 93 a and 93 b of the tubular male coupling member 90 passing in a guided way through the first and second parallel transversal slots 104 a, 104 b of the tubular female coupling member 100 in a perpendicular way, in such a way that the retention edge 94 a and 94 b (not illustrated) of each of the first and second retention tabs 93 a and 93 b of the of the projections 92 a, 92 b, are locked on the inner surface of the tubular female coupling member 100, being retained both coupling members to each other, in a “T” fashion, such as it is illustrated in FIG. 5B;

In the embodiment illustrated in FIG. 5A, the retention tabs 93 a, 93 b being flexed inwardly at the inner surface of the tubular male coupling member 90, conversely of the embodiment of FIG. 5.

In a sixth embodiment of the invention, illustrated in FIG. 6, the snap coupling system between a tubular male coupling member of a quadrangular cross section, to be assembled in a “+” fashion, with a tubular female coupling member of a circular cross section, of the present invention, this having:

a tubular male coupling member 110, of a quadrangular cross section, having a first side wall 111 a and a second side wall 111 b; an upper wall 112 a and a lower wall 112 b; a first retention tab 113 a and a second retention tab 113 b, parallel to each other, both practiced in a transversal way in an intermediate portion of the side walls 111 a and 111 b extending from the edge of the upper wall 112 a to the lower wall 112 b presenting a retention edge 114 a and 114 b respectively, and a rectangular cut 115 in the upper wall 112 a, placed upwardly of the tabs 113 a and 113 b, to allow the input of the tubular female coupling member 120 into the tubular male coupling member 110 through said rectangular cut 115;

tubular female coupling member 120 to be coupled to the tubular male coupling member 110 in a “+” fashion, of a circular cross section, having: an inner surface and an outer surface; a first end 121 a and a second end 121 b; a first and a second parallel transversal slots 122 a, 122 b, aligned at the same height to each other, at an intermediate portion of the tubular female coupling member 120, each of which extends vertically widthwise of the tubular female coupling member 120, such as it is illustrated in FIG. 6, wherein the distance between the first and second slots 122 a and 122 b is similar to the distance existing between the first and second tabs 113 a and 113 b, of the tubular male coupling member 110, such as is illustrated in FIG. 6;

the retention edges 114 a and 114 b of the retention tabs 113 a and 113 b preferably having its edge curved with the same curvature as the inner of the tubular female coupling member 120;

wherein the first and second tabs 113 a and 113 b of the side walls 111 a and 111 b of the tubular male coupling member 110, passing in a guided way through the first and second parallel transversal slots 122 a, 122 b of the tubular female coupling member 120, in a “+” fashion in such a way that the retention edge 114 a, 114 b of each of the first and second retention tabs 113 a and 113 b, are locked at the inner surface of the tubular female coupling member 120, being retained both coupling members to each other in a “+” fashion such as is illustrated in FIG. 6;

In the embodiment of FIG. 6A, the retention tabs 113 a and 113 b being flexed inwardly of the inner surface of the side walls 111 a and 111 b of the tubular male coupling member 110, conversely to the embodiment illustrated in FIG. 6.

In a seventh embodiment of the invention, illustrated in FIG. 7, the snap coupling system between a tubular male coupling member, of a circular cross section, to be assembled in a “+” fashion with a tubular female coupling member, of a quadrangular cross section, of the present invention, this comprises:

a tubular male coupling member 130 of a circular cross section, having: a first end 131 a and a second end 131 b; a first slot 132 a and a second slot 132 b parallel to each other extending transversally at an intermediate portion of the tubular male coupling member 130, to approximately one third of the bosy of tubular male coupling member 130; a first and second retention tabs 133 a and 133 b (not illustrated) directed opposite to each other between the slots 132 a, 132 b at the curved surface of the tubular male coupling member 130 and lifted in an angle outwardly of said tubular male coupling member 130, presenting a retention edge 134 a and 134 b (not illustrated);

a tubular female coupling member 140, to be coupled to the tubular male coupling member 130 in a “+” fashion, of a quadrangular cross section, having: an inner surface and an outer surface; a first end 141 a and a second end 141 b; a first side wall 142 a and a second side wall 142 b; and a upper wall 143 a and a lower wall 143 b; and a quadrangular cut 144 in its lower wall 143 b in an intermediate portion of the tubular female coupling member 140, having the same width as the slots 132 a and 132 b of the tubular male coupling member 130;

wherein the first and second slots 132 a and 132 b, with its respective tabs 133 a and 133 b (not illustrated) of the tubular male coupling member 130, passing in a guided way through the edges of the side walls 142 a and 142 b of the quadrangular cut 144 of the tubular female coupling member 140 coupling in a “+” fashion in such a way that the retention edge 134 a, 134 b (not illustrated), of each of the first and second retention tabs 133 a and 133 b (not illustrated), are locked on the inner surface of the tubular female coupling member 140, being retained both coupling members to each other in a “+” fashion, such as is illustrated in FIG. 7A.

In an eighth embodiment of the invention, illustrated in FIG. 8, the snap coupling system between a tubular male coupling member, of a circular cross section, to be assembled in a “+” fashion with a tubular female coupling member, of a circular cross section, of the present invention, this comprises:

tubular male coupling member 150, of a circular cross section, having: a first end 151 a and a second end 151 b; a first tab 152 a and a second tab 152 b (not illustrated), opposed to each other at the curved surface of the tubular male coupling member 150, extending transversally at an intermediate portion of the tubular male coupling member 150, to about one third of the body of the tubular male coupling member 150 and lifted in an angle outwardly of said tubular male coupling member 150, each of which presenting a retention edge 153 a and 153 b (not illustrated);

a tubular female coupling member 160, of a circular cross section, to be coupled to the tubular male coupling member 150 in a “+” fashion, of a circular cross section, having: a first end 161 a and a second end 161 b; and a circular cut 162 at an intermediate portion of the tubular female coupling member 160, having the same width than the tabs 152 a and 152 b (not illustrated) of the tubular male coupling member 150;

wherein the first and second tabs 152 a and 152 b (not illustrated), with its respective retention edges 153 a and 153 b (not illustrated) of the tubular male coupling member 150 passing in a guided way through the lateral edges of the circular cut 162 of the tubular female coupling member 160 being coupled in a “+” fashion in such a way that the retention edge 153 a, 153 b (not illustrated), of each of the first and second retention tabs 152 a and 152 b (not illustrated), be locked at the inner surface of the circular cut 162 of the tubular female coupling member 160, being retained both coupling members to each other, in a “+” fashion as can be observed at FIG. 8A.

A ninth embodiment of the snap coupling system between tubular coupling members, of a quadrangular cross section to be angularly coupled, in an any suitable angle, of the present invention, illustrated in FIGS. 9, 9A and 9B, this comprises:

a tubular male coupling member 170 of a quadrangular cross section, having a first end 171 a and a second end 171 b, the first end 171 a being cut in an angle to the second end 171 b; a first side wall 172 a and a second side wall 172 b shorter than the first side wall 172 a; an upper wall 173 a and a lower wall 173 b, which are cut at the same angle than the first end 171 a; a first projection 174 a extending from the first end 171 a of the first side wall 172 a of the tubular male coupling member 170, said projection 174 a including a retention tab 175 a, cut therein directed to the second end 171 b of said tubular male coupling member 170 and lifted in an angle outwardly of said tubular male coupling member 170, presenting a retention edge 176 a; and a second projection 174 b which is shorter than the first projection 174 a, extending from the first end 171 a of the second side wall 172 b of the tubular male coupling member 170, said projection 174 b including a retention tab 175 b cut therein, directed also to the second end 171 b of the tubular male coupling member 170, and lifted in an angle outwardly of said tubular male coupling member 170 presenting a retention edge 176 b (not illustrated);

a tubular female coupling member 180, of a quadrangular cross section, to be angularly coupled to the tubular male coupling member 170, having: an inner wall and an outer wall; a first end 181 a and a second end 181 b; a first side wall 182 a and a second end wall 182 b; and an upper wall 183 a and a lower wall 183 b; a first and a second parallel transversal slots 184 a, 184 b, each of which extending vertically widthwise of the first side wall 182 a of the tubular female coupling member 180, such as illustrated in FIG. 9, wherein the distance between the first and second slots 184 a and 184 b is similar to the distance existing between the first and second projections 174 a and 174 b of the tubular male coupling member 170, such as it is illustrated in FIG. 9;

wherein the first and second projections 174 a and 174 b being angularly defaced to each other, with their respective retention tabs 175 a, 175 b of the side walls 172 a and 172 b of the tubular male coupling member 170, passing in a guided way through the first and second parallel transversal slots 184 a, 184 b of the first side wall 182 a of the tubular female coupling member 180 in an angular way, such that the retention edge 176 a, 176 b (not illustrated) of each of the first and second retention tabs 175 a and 195 b of the projections 174 a, 174 b are locked at the inner surface of the first side wall 182 a of the tubular female coupling member 180, being angularly retained both coupling members to each other, in accordance to the angle cut of the first end 171 a of the tubular male coupling member 170, such as it can be observed from FIG. 9B.

In the embodiment illustrated in FIG. 9A, the retention tabs 175 a and 175 b being flexed inwardly of the inner surface of the side walls 172 a and 172 b of the tubular male coupling member 170, conversely to the embodiment illustrated in FIG. 9A.

Additionally, the tubular female coupling member 180, can include a pair of slots (not illustrated) in its side walls 182 b to angularly coupling an additional tubular male coupling member, similar and opposite to the 170.

In a tenth embodiment of the snap coupling system between coupling members, illustrated in FIG. 10, comprising tubular male coupling member, of a quadrangular cross section, having two retention tabs opposite to each other, lifted in an angle outwardly, and a tubular female coupling member of a quadrangular cross section, having a passing through retention aperture, to be assembled to each other in a “+” fashion, comprising:

a tubular male coupling member 190 of a quadrangular cross section, having: a first end 191 a and a second end 191 b; a first side wall 192 a and a second side wall 192 b; an upper wall 193 a and a lower wall 193 b; a first and a second retention tabs 194 a, 194 b (not illustrated) cut in the side walls 192 a and 192 b, at an intermediate portion of the tubular male coupling member 190, directed to the second end 191 b of said tubular male coupling member 190, and lifted in an angle outwardly of said tubular male coupling member 190, presenting a retention edge 195 a, 195 b (not illustrated); and a third and a fourth retention tabs 194 c and 194 d (not illustrated) at an intermediate portion of the tubular male coupling member 190, at the same height than the tabs a 194 a and 194 b, but directed to the first end 191 a of said tubular male coupling member 190 and lifted in an angle outwardly of said tubular male coupling member 190, presenting a retention edge 195 c, 195 d (not illustrated), opposite to the first and second retention tabs 194 a, 194 b, cut at the upper and lower walls 193 a and 193 b of the tubular male coupling member 190; and

a tubular female coupling member 200, of a quadrangular cross section, having a first end 201 a and a second end 201 b; an upper wall 202 a and a lower wall 202 b; a first and a second side walls 203 a and 203 b; and a passing through retention aperture 204, of a quadrangular cross section, at each of the upper and lower walls 202 a and 202 b, at an intermediate portion of the tubular female coupling member 200, through which aperture 204 passing the tubular male coupling member 190 by passing the tabs 194 a 194 b, 194 c and 194 d trough said aperture 204 to be locked at the interior thereof, assembling to each other in a “+” fashion.

In a variation of this tenth embodiment, illustrated in FIG. 10A, each retention tab of the tubular male coupling member 190, comprising a first retention tab LR1 starting from an intermediate PI of one of its walls 192 a, 192 b, 193 a, 193 b, directed to the first end 191 a of the tubular male coupling member 190, and a second retention tab LR2 starting of the same intermediate portion PI of the same wall as the retention tab LR1, but directed to the end 191 b of the tubular male coupling member 190; both retention tabs LR1 and LR2 being distributed at an space similar to the cross section of the tubular female coupling member 200, such that on passing the tubular male coupling member between the passing through the quadrangular retention aperture 204 of the tubular female coupling member 200, each tab LR1 and LR2 being bilaterally locked both to the first end 191 a, as to the second end 191 b of the tubular male coupling member 190.

Also in this embodiment, it is possible to include a single tab in one sense and the other in an opposite sense, depending of the strength and stability which it is desired for the coupling system.

In an eleventh embodiment of the snap coupling system for using with a plurality of tubular coupling members, of quadrangular cross section, to be assembled in a fence or gate, of the present invention, illustrated in FIGS. 11, 11A and 11B, comprising:

at least a tubular male coupling member 210, of a quadrangular cross section, having: a first end 211 a and a second end 211 b; a first side wall 212 a and a second side wall 212 b; a front wall 213 a and a rear wall 213 b (not illustrated); a first and a second retention tabs 214 a, 214 b cut in the side walls 212 a and 212 b directed to the second end 211 b of said tubular male coupling member 210 and lifted in an angle outwardly of said tubular male coupling member 210, presenting a retention edge 215 a, 215 b; and a third and four retention tabs 216 a and 216 b opposite to the first and second retention tabs 214 a, 214 b, spaced to each other at a selected distance, cut at the same side walls 212 a and 121 b, directed to the first end 211 a of said tubular male coupling member 210, lifted in an angle outwardly of said tubular male coupling member 210, presenting a retention edge 217 a and 217 b, respectively, directed to the first end 212 a of the tubular male coupling member 210 and lifted at an angle outwardly of said tubular male coupling member 210;

at least two tubular female coupling member 220 a, 220 b of a quadrangular cross section, which are retained by retention posts PR1, PR2 (FIG. 11A) to which at least a tubular male coupling member 210 is coupled, to be maintained coupled avoiding that these tubular female coupling members could became detached, forming a fence or gate, each of the tubular female coupling members 220 a and 220 b has: a first end 221 a and a second end 221 b; a first and second lateral walls 222 a and 222 b (not illustrated); and an upper wall 223 a and a lower wall 223 b; at least two transversal apertures 224 extending horizontally crossing the upper and lower walls 223 a and 223 b of each tubular female coupling member 220 a, 220 b, spaced at a selected distance similar to that of the retention tabs 214 a, 214 b, 216 a and 216 b of the tubular male coupling member 210, such as it is illustrated in FIGS. 11 and 11A;

wherein the first and second retention tabs 214 a, 214 b of the side walls 212 a and 212 b of the tubular male coupling member 210, passing in a guided way through the first and second transversal apertures 224 of the upper and lower walls 223 a and 223 b (not illustrated) of the tubular female coupling member 220 a and 220 b, in such a way that the retention edge 215 a, 215 b of each of the first and second retention tabs 214 a and 214 b, of the side walls 212 a and 212 b of the tubular male coupling member 210, be locked on the upper surface of the upper wall 223 a of the tubular female coupling member 220, in such a way that prevents that the tubular male coupling member 210 be detached or retires by its lower end 211 b; and the third and fourth retention tabs 216 a and 216 b of the side walls 212 a and 121 b of the tubular male coupling member 210, passing in a guided way through the aperture 224 of the upper and lower walls 223 a and 223 b of the tubular female coupling member 220, in such a way that the retention edge 217 a, 217 b of each of the third and fourth retention tabs 216 a and 216 b, of the side walls 212 a and 212 b of the tubular male coupling member 210 be locked on the lower surface of the lower wall 223 b (not illustrated) of the tubular female coupling member 220 b, in such a way that prevents that the tubular male coupling member 210 be detached by its upper end 211 a, such as it is observed from FIGS. 11 and 11A.

In another embodiment of the tubular male coupling members 210, as it is illustrated in FIG. 11B, each of the tubular male coupling member 210, has a retention tab 214 a, 216 b with its retention edge 215 a, 217 b, directed to the first end 211 a, in its first side wall 212 a and a retention wall 214 a, 216 b, with its retention edge 215 a, 217 b, in its second side wall 212 b, but directed to the second end 211 b, in such a way that each of the tubular male coupling members being retained in both senses by its respective intermediate parts.

It should be understand that in all embodiments formerly described, when coupling the tubular male coupling member with the tubular female coupling member, the retention tabs of the tubular male coupling member are momentarily flexed to allow the tabs passing through the slots of the tubular female coupling member and then, on completely entering the tubular male coupling member into the tubular female coupling member, the tabs recover its position so that its retention edge be locked at the interior of the tubular female coupling member.

It should be additionally understand that the fence or gate assembled in accordance to the formerly described, can comprise a plurality of tubular male coupling members and tubular female coupling members, under the condition that include the tabs and slots corresponding to the number of coupling members.

Furthermore, in the embodiment of FIG. 10, the tubular female coupling members can be solid of quadrangular or rectangular cross section, as may be the cross section form of the tubular male coupling member.

Additionally, both tubular male and female coupling members can have a circular cross section.

Also, as should be evident from the analysis of the tubular female coupling members, of the present invention, all of them present at least a flat or curved surface, with its coupling slots at a unique surface, without the rest of the surrounding walls, which could be only a single flat or curved wall.

All of these embodiments could be visualized from the following Table 1 of embodiments

TABLE 1 Cross Section Cross Section of the tubular of the tubular male coupling female coupling Coupling FIGS. Embodi- member member Type No. ment Quadrangular Quadrangular “T” 1, 1A, 1B, First 1C, 1D Quadrangular Quadrangular “+” 2, 2A, 2B Second Quadrangular Circular “T” 3, 3A, 3B Third Circular Circular “T” 4, 4A, 4B Fourth Circular Quadrangular “T” 5, 5A, 5B Fifth Quadrangular Circular “+” 6, 6A, 6B Sixth Circular Quadrangular “+” 7, 7A Seventh Circular Circular “+” 8, 8A Eight Quadrangular Quadrangular Angular 9, 9A, 9B Ninth Quadrangular Quadrangular “+” 10, 10A, Tenth 10B Quadrangular Quadrangular Fence or 11, 11A Eleventh Gate

The unions referred at the specific embodiments can support a high amount of weight, which give opportunity of apply them in diverse situations.

It should be finally understand that the snap coupling system between metallic or non-metallic tubular coupling members, of the present invention, is not limited to the embodiments formerly described and that the persons skilled in the art will be able, by the teachings herein disclosed, to carry out changes in the snap coupling system between tubular coupling members, of the present invention, which will be within the true scope of the invention, which will be set forth exclusively by the following claims. 

1. A snap coupling system between a tubular male coupling member and a tubular female coupling member, the tubular male coupling member and the tubular female coupling member have quadrangular shaped cross sections, comprising: the tubular male coupling member having: a first end, a second end, an inferior wall, a superior wall and opposed lateral walls; a quadrangular opening cut in a middle portion of the inferior wall, and a first groove and a second groove parallel to each other cut in each lateral wall respectively along two opposite sides of the quadrangular opening, each of the first groove and the second groove extending from an edge of the inferior wall toward the superior wall, a retention tab transversely cut in each lateral wall locating between the first groove and the second groove and extending from the inferior wall toward the superior wall, the retention tab is lifted in an angle with respect to a surface of the surrounding wall and has a retention edge; a tubular female coupling member having: a first end, a second end, an inferior wall, a superior wall and opposed lateral walls; a quadrangular opening cut in a middle portion of the superior wall, a first groove and a second groove parallel to each other transversely cut in each lateral wall along two opposite sides of the quadrangular opening of the tubular female coupling member respectively, each of the first groove and the second groove extending from an edge of the superior wall toward the inferior wall; wherein the quadrangular opening of the tubular female coupling member corresponds to the quadrangular opening of the tubular male coupling member so that each lateral wall at the quadrangular opening of the tubular male coupling member enters the quadrangular opening of the tubular female coupling member; the first groove and the second groove of the tubular female coupling member corresponds to the first groove and the second groove of the tubular male coupling member respectively, allowing each retention tab of the tubular male coupling member to momentarily flex in order to tightly pass through the quadrangular opening of the tubular female coupling member and get back to its position in order to retain the retention edge against a side of the quadrangular opening for coupling the tubular male coupling member and the tubular female coupling member in a cross (“+”) fashion.
 2. The snap coupling system as claimed in claim 1 wherein the first groove and the second groove of the tubular male coupling member and/or the tubular female coupling member transversally extending at a middle portion thereof to about one third of its body.
 3. The snap coupling system as claimed in claim 1 wherein the pair of retention tabs transversely cut between the first groove and the second groove in opposite lateral walls of the tubular female coupling member respectively.
 4. A snap coupling system between tubular coupling members comprising: a tubular male coupling member having: a first end, a second end and a surrounding wall; an opening and a pair of spaced retention tabs transversely cut at the surrounding wall, wherein each of the pair of retention tabs is lifted in an angle with respect to a surface of the surrounding wall and has a retention edge; and a tubular female coupling member having: a first end, a second end and a surrounding wall; and an opening cut in a middle portion of the surrounding wall, wherein the opening correspond to the pair of the retention tabs of the tubular male coupling member, allowing each of the pair of the retention tabs of the tubular male coupling member to momentarily flex in order to tightly pass through the opening and get back to its position in order to retain the retention edge of each retention tab against a side of the opening for coupling the tubular male coupling member and the tubular female coupling member in a cross (“+”) fashion; wherein one of the tubular male coupling member and the tubular female coupling member has a quadrangular shaped cross section, and the other has a circular shaped cross section.
 5. The snap coupling system as claimed in claim 1, wherein the retention tabs are angularly directed inwardly from the tubular male coupling member.
 6. The snap coupling system as claimed in claim 1, wherein each retention tab having a slot at an end central portion thereof for inserting a tool through the same and facilitating the flexing of the retention tab until a desired position.
 7. The snap coupling system as claimed in claim 4, wherein the retention tabs are angularly directed inwardly from the tubular coupling member.
 8. The snap coupling system as claimed in claim 4, wherein each retention tab having a slot at an end central portion thereof for inserting a tool through the same and facilitating the flexing of the retention tab until a desired position.
 9. A snap coupling system between tubular coupling members comprising: a tubular male coupling member with a circular shaped cross section having: a first end, a second end and a surrounding wall; and a pair of spaced retention tabs transversely cut at the surrounding wall, the pair of retention tabs is transversely lifted in an angle with respect to a surface of the surrounding wall and toward opposes directions, each retention tab has a retention edge; and a tubular female coupling member having: a first end, a second end and a surrounding wall; and an opening cut in a middle portion of the surrounding wall, wherein the opening correspond to the pair of the retention tabs of the tubular male coupling member, allowing each of the pair of the retention tabs of the tubular male coupling member to momentarily flex in order to tightly pass through the opening and get back to its position in order to retain the retention edge of each retention tab against a side of the opening for coupling the tubular male coupling member and the tubular female coupling member in a cross (“+”) fashion.
 10. The snap coupling system as claimed in claim 9 wherein the tubular female coupling member has a circular shaped cross section, and a circular opening cut in a middle portion of a surrounding wall of the tubular female coupling member, wherein a space between the pair of the retention tabs of the tubular male coupling member corresponds to a diameter of the circular opening of the tubular female coupling member so that each of the pair of the retention tabs locates in the circular opening on a curved surface of the tubular female coupling member.
 11. The snap coupling system as claimed in claim 10 wherein the circular opening of the tubular female coupling member transversally extending at a middle portion thereof to about one third of its body.
 12. The snap coupling system as claimed in claim 10 wherein a first groove and a second groove transversely cut in the surrounding wall of the tubular male coupling member with a circular shaped cross section, the first groove and the second groove being spaced to each other and locating at two sides of the pair of the retention tabs, and the tubular female coupling member has a quadrangular shaped cross section, a quadrangular opening cut in a middle portion of a superior wall of the tubular female coupling member, wherein a space between the first groove and the second groove of the tubular male coupling member corresponds to the transverse size of the quadrangular opening of the tubular female coupling member, and a space between the pair of the retention tabs corresponds to the longitudinal size of the quadrangular opening of the tubular female coupling member so that each of the pair of the retention tabs of the tubular male coupling member enter the quadrangular opening of the tubular female coupling member, and the first groove and the second groove receive the opposite lateral walls of the tubular female coupling member respectively.
 13. The snap coupling system as claimed in claim 12 wherein the first groove and the second groove of the tubular male coupling member and/or the quadrangular opening of the tubular female coupling member transversally extending at a middle portion thereof to about one third of its body.
 14. A snap coupling system between tubular coupling members comprising: a tubular male coupling member having a quadrangular shaped cross section including: a first end and a second end; opposite side walls; a front wall and a rear wall; a first retention tab, a second retention tab, a third retention tab and a fourth retention tab cut in the opposite side walls, the front wall or the rear wall in a middle position of the tubular male coupling member respectively, the first retention tab and the second retention tab directed toward the second end of the tubular male coupling member, but the third retention tab and the fourth retention tab directed toward the first end of said tubular male coupling member, wherein each retention tab raised at an angle outwardly from said tubular male coupling member and having a retention edge; a tubular female coupling member having a quadrangular shaped cross section including: a first end and a second end; opposite side walls; and a superior wall and an inferior wall; a quadrangular opening cut in a middle position of the tubular female coupling member through the opposite side walls or the superior and the inferior wall; wherein the tubular male coupling member passed through the quadrangular opening in the opposite side walls or the superior and the inferior wall of the tubular female coupling member, allowing each retention tab of the tubular male coupling member to momentarily flex in order to tightly pass through the quadrangular opening and get back to its position, wherein the retention edges of the first retention tab and the second retention tab of the tubular male coupling member retaining against an edge of the quadrangular opening in one of the opposite side walls or the superior and the inferior wall of the tubular female coupling member respectively, and the retention edges of the third retention tab and the fourth retention tab retaining against an edge of the quadrangular opening in another one opposite to the wall of the tubular female coupling member for coupling the tubular male coupling member and the tubular female coupling member in a cross (“+”) fashion.
 15. The snap coupling system as claimed in claim 14 wherein the first retention tab and the second retention tab of the tubular male coupling member cut in middle positions of the opposite side walls respectively, and the third retention tab and the fourth retention tab cut in the same positions of the front wall and the rear wall respectively.
 16. The snap coupling system as claimed in claim 14 wherein the first retention tab cut in a middle position of one of the opposite side walls of the tubular male coupling member and directed toward the second end, the second retention tab cut in the same middle position of the side wall and directed toward the first end, the third retention tab cut in a middle position of the other one opposite to the side wall of the tubular male coupling member and directed toward the second end, and the fourth retention tab cut in the same middle position of the other side wall and directed toward the first end, a space between the first retention tab and the second retention tab or the third retention tab and the fourth retention tab being distributed to correspond to the transverse size of the tubular female coupling member. 